The story opens with a memorable description of Charley, a moondog that looks like "an oversized comma of something vague and luminous" with a "fat yellow balloon" head and a tapering body. Mullen establishes the creature's electronic nature early: Charley can cling to metal, propel himself, and short-circuit equipment—as he does by burning out a transformer, landing both him and his owner Tod Denver in a "mutual doghouse." The opening paragraph also sets the tone with a wry comparison: "Temperature outside was a rough 280 degrees F., which is plenty rough and about three degrees cooler than Hell."

A Pet That Defines the Protagonist

Charley is not merely a comic sidekick; the creature's behavior and Denver's reactions to it establish character and conflict. Denver won Charley in a crap game and has tried repeatedly to sell or trade him, but Charley always returns—"Charley liked Denver too well to put up with less interesting owners." The relationship is one of exasperated affection: Denver is "fond of Charley, as one might be of an idiot child." This dynamic recurs throughout the excerpts, with Charley causing mechanical failures and Denver responding with mock songs like "Mad dogs and Martians go out in the Lunar sun." The pet's magnetic personality and physiology mirror Denver's own stubbornness and resourcefulness.

Flight and Pursuit Across the Lunar Surface

When a ship appears "painted a quick-dying trail of fire upon the black vault of sky," Denver must decide between fighting or fleeing. The excerpts show him choosing flight, motivated by the presence of a woman named Darbor: "he had desperate, painful desire to live for her." The chase becomes a "nerve-wracking game of hare and hounds" across "tricky floods of Earthlight" and "slopes and spills of broken rock." Mullen emphasizes the harsh environment: the fugitives must navigate by shadow-apex calculations, guessing whether the light source is the sun or Earth. The tension is heightened by the need to locate an old Martian working before the pursuers close in.

The Martian Mine as a Goal and a Gamble

The old Martian mine represents both a refuge and a potential source of wealth. Denver follows "deep-cut arrow markings" that lead to the site, but the directions are imprecise—"Laird Martin had expected his directions to be gone into under less harrowing circumstances." The search involves calculating the "shadow-apex of Mitre Peak at 2017 ET," a detail that grounds the story in a specific, technical challenge. Once the markings are found, the race becomes a grim sprint to reach the mine and set up defenses. The stakes are explicit: "Life, or a fighting chance to defend life, possible wealth from the ancient workings, made a glittering goal ahead."

Voice and Structure in the Excerpts

Mullen's prose mixes hard-boiled dialogue with vivid, sometimes playful description. The opening line—"It was Charley's fault, of course; all of it..."—sets a wry, confessional tone. The narrative moves between action and reflection, with short, punchy sentences during chase scenes: "He chose flight." The excerpts also reveal a tendency toward simile and metaphor: the moondog "looked like an oversized comma," and the ship's landing flares are "short-lived rocket landing flares." The structure alternates between Denver's internal calculations and external threats, creating a rhythm of problem-solving and sudden danger. These stylistic choices give the story a distinctive voice that balances humor with suspense.

Readers should pay attention to how Mullen uses Charley not just for comic relief but as a plot device that creates mechanical problems and solutions. The moondog's electronic nature may prove crucial in later scenes. Likewise, the technical details about Lunar navigation and mining are not mere decoration—they drive the plot forward. The excerpts leave the outcome uncertain, but the careful setup of Denver's character and the mine's location suggests a payoff that rewards close reading of the early clues.